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40
DM Area Allocations
Section 3-2
Note Setting the IORD/IOWR Areas within the following ranges.
• Set the first word in the IORD Area, and the first word in the IOWR Area.
• The IORD Area and IOWR Area can be set in any order and the first part
of the allocated DM words can be left unused by either area.
3-2-2 Overview of DM Allocations
The first address in the DM words allocated in the CPU Unit is “m.”
C200HX/HG/HE, C200H, C200HS: m = DM 1000 + 100
×
Unit No.
CS1-series PCs: m = 100
×
Unit No.
First word in IORD
Area
First word in
IOWR Area
Not used
IORD Area
IOWR Area
Words
99
First word in
IOWR Area
First word in IORD
Area
Not used
IOWR Area
IORD Area
Words
99
10
10
Shared
memory
address
DM
address
Bit Name Function Settings (hex) ASCII Unit’s
default
(hex)
0 m 00 to
07 Program No. Sets the startup program number. 00: No.1
01: No.1
02: No.2
03: No.3
04: No.4 00
08 to
15 Automatic
transfer from
flash ROM Determines whether the program is
read from the flash ROM to the user
memory area at power ON or when
the Unit is restarted. 00: Do not transfer
(user memory
mode)
5A: Transfer flash
ROM to user
memory area
00
01 m + 1 00 to
07 Startup mode Determines whether or not the pro-
gram runs automatically at power
ON or when the Unit is restarted.
When manual start is designated,
start using the START/STOP switch
on the front panel of the ASCII Unit
or the RUN command from the ter-
minal. (See
page 20 for details on
the START/STOP switch.)
00: Manual start
5A: Automatic start 00
08 to
11 IORD/IOWR
Area transfer Determines whether or not the CPU
Unit’s 90 words (DM m + 10 to m +
99) are sent to the ASCII Unit’s
shared memory (IORD/IOWR) area
at power on or restart. 0: No transfer
1: Transfer 0
12 to
15 Not used --- Set to 0 (OFF) 0